Normal pattern VEP was measured to applicate its value in the comparison with abnormal pattern VEP findings of various ocular disease. Mean P1 latency time in 74 healthy subjects of 20 to 60 years old with uncorrected or corrected visual acuity better than 0.9 was 92.51 +/- 4.35 msec and mean amplitude was 11.58 +/- 3.45 micro V. There was no statistically significant difference between male and female iri latency time and amplitude. The latency time was delayed in the 6 th decades. The amplitude was largest in VEP stimulated with 13.1 X 10.6 min checksize, but the changes of latency in 60 min to 10 min check-size was not statistically signifiant. In the emetropic state, the amplitude was largest and visual acuity was correlated with the amplitude. In miotic eyes, the latency time was delayed and the amplitude was largest in physiologic pupil. The amplitude and latency was similar in the location of recording electorde at 2~4 cm above inion.